115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/*
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* Copyright (c) 2005-2010, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: light-sensor.c,v 1.3 2010/01/14 20:23:02 adamdunkels Exp $
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*/
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#include <stdlib.h>
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#include <io.h>
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#include "contiki.h"
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#include "lib/sensors.h"
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#include "dev/light-sensor.h"
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const struct sensors_sensor light_sensor;
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/*
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* Initialize periodic readings from the 2 photo diodes. The most
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* recent readings will be stored in ADC internal registers/memory.
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*/
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static void
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light_sensor_init(void)
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{
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P6SEL |= 0x30;
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P6DIR = 0xff;
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P6OUT = 0x00;
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/* Set up the ADC. */
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ADC12CTL0 = REF2_5V + SHT0_6 + SHT1_6 + MSC; // Setup ADC12, ref., sampling time
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ADC12CTL1 = SHP + CONSEQ_3 + CSTARTADD_0; // Use sampling timer, repeat-sequenc-of-channels
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ADC12MCTL0 = (INCH_4 + SREF_0); // photodiode 1 (P64)
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ADC12MCTL1 = (INCH_5 + SREF_0); // photodiode 2 (P65)
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ADC12CTL0 |= ADC12ON + REFON;
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ADC12CTL0 |= ENC; // enable conversion
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ADC12CTL0 |= ADC12SC; // sample & convert
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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switch(type) {
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/* Photosynthetically Active Radiation. */
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case LIGHT_SENSOR_PHOTOSYNTHETIC:
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return ADC12MEM0;
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/* Total Solar Radiation. */
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case LIGHT_SENSOR_TOTAL_SOLAR:
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return ADC12MEM1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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switch(type) {
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case SENSORS_ACTIVE:
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case SENSORS_READY:
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return (ADC12CTL0 & (ADC12ON + REFON)) == (ADC12ON + REFON);
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int c)
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{
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switch(type) {
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case SENSORS_ACTIVE:
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if(c) {
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if(!status(SENSORS_ACTIVE)) {
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light_sensor_init();
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}
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} else {
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/* shut down sensing */
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ADC12CTL0 = 0;
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(light_sensor, "Light",
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value, configure, status);
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